Definition of Perimenopause

Perimenopause: The time in a
woman's life when physiological changes occur that begin the transition to
menopause. Menopause is the time when there have been no menstrual periods for 12 consecutive months. A woman can usually tell if
she is experiencing symptoms characteristic of the perimenopause because her
menstrual periods start changing.

The changes of the menopause transition (perimenopause) typically begin
several years before the natural menopause. This is a time when the levels of
hormones produced by the aging ovaries fluctuate, leading to irregular menstrual
patterns (irregularity in the length of the period, the time between periods,
and the level of flow) and hot flashes (a sudden warm feeling with blushing).
Other changes associated with the perimenopause and menopause include night
sweats, mood swings, vaginal dryness, fluctuations in sexual desire (libido),
forgetfulness, trouble sleeping, and fatigue (probably from
the loss of sleep).

The timing of natural menopause is variable. In the western world the average
age is now 51. There is no relation between the time of a woman's first period
and her age at menopause. The age at menopause is not influenced by a woman's
race, height, number of children, or use of oral contraceptives.